Justin Bieber's Haircuts Have Come Full Circle

There is no separating Justin Bieber's fame from his hair. After all, the pop star became famous for the singular way he brushed his hair forward in a spiral around his adolescent head. The result: teen girls went crazy and teen boys invested in a brush. Well, it looks like the singer is bringing back his signature style—albeit an updated, manlier version. To help make sense of this big news, we're taking a look at the evolution of Bieber's hairstyles over the past six years. Here are the highs and lows of the musician's locks (yes, the dreads are in there). Based on this very scientific evidence, can the lifecycle of a trend can be measured according to Bieber's hair?